21007815

素因数分解:

$3^1\times 5^1\times {\mathrm{131}}^1\times {\mathrm{10691}}^1$

素因数の和:10830

約数の個数: 16

約数和(自身を含む): 33872256

約数和(自身を除く): 12864441

約数列:

[1, 3, 5, 15, 131, 393, 655, 1965, 10691, 32073, 53455, 160365, 1400521, 4201563, 7002605, 21007815]

約数ペア:

[(1, 21007815), (3, 7002605), (5, 4201563), (15, 1400521), (131, 160365), (393, 53455), (655, 32073), (1965, 10691)]